Sound record disk



Feb. 21, 1939.

o. ZECHA 2,148,225

SOUND RECORD DISK Filed July s, 1956 //v we)? ecu L7 p Patented Feb. 21,1939 PATENT OFFICE 2,148,225 SOUND RECORD DISK Otto Zecha, Vienna,Austria Application July 8, 1936; Serial In Austria. September 17,

No. 89,641 1935 I 1 Claim. (Cl. 274-42) This invention relates toimprovements in sound records.

When cutting sound record disks or the like while a sound groove whichis too deep prevents the recording of the fine over- I To a foundationbase for example of red colour there are anobteining satisfactoryrecording.

A. sectional view ofa record disk comprising layers.

What I claim isdisk for phonographic recording comprising A at least twosuperposed layers of difierent coloured

